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Zero-energy states of graphene triangular quantum dots in a magnetic field

机译:磁场中石墨烯三角形量子点的零能态

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摘要

We present a tight-binding theory of triangular graphene quantum dots (TGQD) with zigzag edge and broken sublattice symmetry in an external magnetic field. The lateral size quantization opens an energy gap, and broken sublattice symmetry results in a shell of degenerate states at the Fermi level. We derive a semianalytical form for zero-energy states in a magnetic field and show that the shell remains degenerate in a magnetic field, in analogy to the zeroth Landau level of bulk graphene. The magnetic field closes the energy gap and leads to the crossing of valence and conduction states with the zero-energy states, modulating the degeneracy of the shell. The closing of the gap with increasing magnetic field is present in all graphene quantum dot structures investigated irrespective of shape and edge termination.
机译:我们提出了在外部磁场中具有锯齿形边缘和破碎的亚晶格对称性的三角形石墨烯量子点(TGQD)的紧束缚理论。横向尺寸量化打开了一个能隙,并且打破的亚晶格对称性导致了费米能级简并状态的壳。我们推导了磁场中零能态的半解析形式,并表明壳层在磁场中仍然是简并的,类似于块状石墨烯的第零朗道能级。磁场缩小了能隙,并导致价态和传导态与零能态相交,从而调节了壳的简并性。在研究的所有石墨烯量子点结构中,无论形状和边缘终止如何,都存在随着磁场的增加而导致的缝隙闭合。

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  • 来源
    《Physical review》 |2013年第15期|155429.1-155429.8|共8页
  • 作者单位

    Department of Physics, Izmir Institute of Technology, IZTECH, TR35430, Izmir, Turkey;

    Institute of Physics, Wroclaw University of Technology, Wroclaw, Poland;

    Emerging Technologies Division, National Research Council of Canada, Ottawa, Canada;

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